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As reported by Christophe Lyon, gcc.target/arm/movdi_movw test fails on big endian targets. This is because on big endian targets the low bits of a 64bit value would be in the highest numbered register of a pair rather than the lowest
numbered register as on little endian targets. This patch fixes that by allowing both r0 and r1. It also changes effective target to use arm_thumb2_ok instead of arm_thumb2 to allow the test on ARM mode targets.